又一个简单的练习
'''
ver6.py: 修改Library增加name属性
'''
class Book:
def __init__(self, title, author):
self.title = title
self.author = author
self.is_checked_out = False
def check_out(self):
if not self.is_checked_out:
self.is_checked_out = True
print(f"The book '{self.title}' by {self.author} has been checked out.")
else:
print("Sorry, the book is already checked out.")
def check_in(self):
if self.is_checked_out:
self.is_checked_out = False
print(f"Thank you for returning '{self.title}' by {self.author}.")
else:
print("The book is not checked out.")
def display_info(self):
status = "Available" if not self.is_checked_out else "Checked Out"
print(f"Title: {self.title}, Author: {self.author}, Status: {status}")
class User:
def __init__(self, username, password):
self.username = username
self.password = password
self.borrowed_books = []
def borrow_book(self, book):
if not book.is_checked_out:
book.check_out()
self.borrowed_books.append(book)
print(f"{self.username}借阅了《{book.title}》。")
else:
print("抱歉，这本书已经被借出了。")
def return_book(self, book):
if book in self.borrowed_books:
book.check_in()
self.borrowed_books.remove(book)
print(f"{self.username}归还了《{book.title}》。")
else:
print("这本书没有被这位用户借阅。")
class Library:
def __init__(self, name):
self.name = name
self.books = []
self.users = []
self.current_user = None
def add_book(self, book):
self.books.append(book)
def add_user(self, user):
self.users.append(user)
def list_books(self):
print(f"{self.name}图书馆目录:")
for book in self.books:
book.display_info()
def search_book_by_name(self, book_name):
for book in self.books:
if book.title == book_name:
return book
return None
def check_book_status(self, book_name):
book = self.search_book_by_name(book_name)
if book:
if book.is_checked_out:
print(f"《{book_name}》已经被借出。")
else:
print(f"《{book_name}》可供借阅。")
else:
print(f"在{self.name}图书馆中找不到《{book_name}》。")
def user_login(self, username, password):
for user in self.users:
if user.username == username and user.password == password:
self.current_user = user
return user
return None
def user_registration(self, username, password):
new_user = User(username, password)
self.users.append(new_user)
print(f"{self.name}图书馆用户 '{username}' 注册成功。")
def user_logout(self):
print(f"再见，{self.current_user.username}！")
self.current_user = None
# 创建图书馆对象
library_name = input("请输入图书馆名字: ")
library = Library(library_name)
# 将图书加入图书馆
library.add_book(Book("了不起的盖茨比", "F. Scott Fitzgerald"))
library.add_book(Book("杀死一只知更鸟", "Harper Lee"))
library.add_book(Book("1984", "George Orwell"))
# 打印欢迎信息
print(f"欢迎使用{library.name}图书馆！")
while True:
print("\n图书馆菜单:")
print("1. 列出图书")
print("2. 检查图书状态")
print("3. 用户登录")
print("4. 用户注册")
print("5. 退出登录")
print("6. 退出程序")
choice = input("请输入您的选择 (1-6): ")
if choice == "1":
library.list_books()
elif choice == "2":
book_name = input("请输入书名: ")
library.check_book_status(book_name)
elif choice == "3":
username = input("请输入用户名: ")
password = input("请输入密码: ")
logged_in_user = library.user_login(username, password)
if logged_in_user:
print(f"欢迎，{logged_in_user.username}！")
# 用户操作（借书、还书等）
while True:
print("\n用户菜单:")
print("1. 借阅图书")
print("2. 归还图书")
print("3. 退出登录")
user_choice = input("请输入您的选择 (1-3): ")
if user_choice == "1":
book_name = input("请输入要借阅的书名: ")
book = library.search_book_by_name(book_name)
if book:
logged_in_user.borrow_book(book)
else:
print("找不到这本书。")
elif user_choice == "2":
book_name = input("请输入要归还的书名: ")
book = library.search_book_by_name(book_name)
if book:
logged_in_user.return_book(book)
else:
print("找不到这本书。")
elif user_choice == "3":
library.user_logout()
break
else:
print("无效的选择。请输入1到3之间的数字。")
else:
print("登录失败。用户名或密码无效。")
elif choice == "4":
username = input("请输入新的用户名: ")
password = input("请输入新的密码: ")
library.user_registration(username, password)
elif choice == "5":
if library.current_user:
library.user_logout()
else:
print("当前没有用户登录。")
elif choice == "6":
print(f"退出{library.name}图书馆。再见！")
break
else:
print("无效的选择。请输入1到6之间的数字。")
